shellphone.app/app/api/newsletter/subscribe.ts

import type { BlitzApiRequest, BlitzApiResponse } from "blitz";
import zod from "zod";

import type { ApiError } from "../../_types";
import appLogger from "integrations/logger";
import { addSubscriber } from "integrations/mailchimp";

type Response = {} | ApiError;

const logger = appLogger.child({ route: "/api/newsletter/subscribe" });

const bodySchema = zod.object({
	email: zod.string().email(),
});

export default async function subscribeToNewsletter(req: BlitzApiRequest, res: BlitzApiResponse<Response>) {
	if (req.method !== "POST") {
		const statusCode = 405;
		const apiError: ApiError = {
			statusCode,
			errorMessage: `Method ${req.method} Not Allowed`,
		};
		logger.error(apiError);

		res.setHeader("Allow", ["POST"]);
		res.status(statusCode).send(apiError);
		return;
	}

	let body;
	try {
		body = bodySchema.parse(req.body);
	} catch (error) {
		const statusCode = 400;
		const apiError: ApiError = {
			statusCode,
			errorMessage: "Body is malformed",
		};
		logger.error(error);

		res.status(statusCode).send(apiError);
		return;
	}

	try {
		await addSubscriber(body.email);
	} catch (error) {
		console.log("error", error.response?.data);

		if (error.response?.data.title !== "Member Exists") {
			return res.status(error.response?.status ?? 400).end();
		}
	}

	res.status(200).end();
}